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Kane Williamson didn't sound thoroughly convinced that sending South Africa in when the second test began at Centurion last night was the right course of action.

His fast-medium bowlers would have been in his ear though and with the pitch ''a little bit soft" in New Zealand skipper Williamson's words, getting amongst the South African top order would have had plenty of appeal.

By lunch, Williamson may have been regretting his decision as South Africa reached 100 without loss, their first century opening stand in 35 test innings.

Makeshift lefthand opener Quinton de Kock had completed his third test 50, and was on 58 off 79 balls, while Stephen Cook had reached 40 off 89 balls.

Bracewell had de Kock dropped on 42, an inside edge to wicketkeeper BJ Watling which he couldn't hold with one glove. Watling had a poor morning with the gloves.

Wagner appealed for lbw against Cook on 36. It was rejected but had New Zealand referred the appeal to the third umpire, would have had Cook out, the replays suggesting the ball would have hit his leg stump.

At the toss there might also have been a small thought that better to bowl than risk a serious inquisition from South Africa's champion new ball pair Dale Steyn and Vernon Philander, who had put the top order through hoops before the rain arrived in Durban a week ago.

That's a kind of negative positive thinking and not one Williamson would espouse.

The bounce was too trampoline-like for the fast bowlers' liking and there was precious little pace in the pitch.

De Kock doesn't appeal as the sort of batsman who frets over what's just happened, switching his thoughts to where he might dispatch the next delivery. New Zealand needed to hit back hard in the second session of the series-deciding test.

New Zealand might not want to know the last four tests at Centurion have been won by the team batting first.